Adjustable bench-dog.



J. FLETCHER.

ADJUSTABLE BENCH DOG.

APPLICATION mum mm. 31,1909.

972,6 1 O, Patented Oct. 11, 1910.

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APPLICATION FILED nno.a1,1909.

Patented Oct. 11, 1910.

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JOSEPH FLETCHER, OF BRICK SCHOOL, NORTH CAROLINA.

ADJUSTABLE BENCH-DOG.

To all whom it may concern:

Be it known that I, Josnrn FLETCHER, a citizen of the United States, anda resident of Brick School, in the county of Edgecombe and State ofNorth Carolina, have invented a new and Improved Adjustable Bench-Dog,of which the following is a full, clear, and exact description.

The invention is an improvement in bench dogs such as are used inconnection with carpenters work benches for holding down one end of aboard, and has for its purpose to provide a dog adjustable along thelength of the bench and at different elevations, having an actuatingmember such as a lever, connected thereto in a manner to force the bitof the dog forwardly and draw it downwardly and clamp the dog in placeby simply moving the lever in one direction, the dog being carried by aclamping-block which is adjustable in an undercut slot passing throughthe bench, which slot allows the shavings and small chips to dropthrough and not interfere with the adjustment of the do I teference isto be had to the accompanying drawings forming a partof thisspecification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a plan of a work bench having my improved dog appliedthereto; Fig. 2 is a fragmentary vertical section through the bench anddog; Fig. 3 is a plan of the dog post; Fig. 4 is a vertical sectionthrough the upper portion of the post, with the bit removed; Fig. 5 isan edge view of the bit; Fig. 6 is an inverted plan of the bit; Fig. 7is a sectional view similar to Fig. 2, with the operating leverdepressed to engage the bit with the board on the bench; Fig. 8 is asection on the line 8-8 of Fig. 2; Fig. 9 is a plan of theclamping-block; Fig. 10 is a plan of the operating lever; and Fig. 11 isa perspective view of the pivot-block.

In carrying out my invention, I provide a work bench 15, with a verticalslot 16, ordinarily extending longitudinally of the bench adjacent tothe front edge, the slot passing through one end of the bench andextending a distance according to the range of adjustment which it isdesired that the do have. The slot, as best shown in Fig. 8, hasoppositely-arranged grooves 17 in the side walls intermediate thethickness when the lever is applied.

of the bench top, with the portion of the Specification of LettersPatent.

Application filed December 31, 1909.

Patented Oct. 11, 1910.

Serial No. 535,752.

slot above the grooves relatively narrower than the portion below. Thedog as constructed in accordance with my invention, is designed to beslidably received in the slot and grooves and comprises a post 18, of awidth to lit the narrower upper portion of the slot, and is capped by abit or spur 19, the bit being preferably detachably connected to thepost by a screw 20, and having cross-ribs 21 on its under side, arrangedto engage corresponding grooves 22, in the top of the post, this mannerof forming the connection between the bit and post obviously preventingthe bit from turning when the screw is tightened, and permitting of thebit being reversed and interchanged with bits likewise constructed onthe under side. The outer edge of the post is provided with a number ofpivot notches 28, arranged one above the other and preferably incliningupwardly and inwardly. In any one of these notches is adapted to engagea pivot 24, carried by a pivot-block or support 25, the latter being inturn carried on a clamping-block 26, and, as shown, seats on the upperface thereof and has a dovetailed connection therewith to permit of theblock being readily detached. The post 18 passes through an opening 27,formed substantially centrally of the clamping-block 26, and at itsinner edge is provided with a number of pivot notches 28, in any one ofwhich is adapted to engage a pivot-pin 29, of a cam-operating lever 30,the notches being downwardly directed a slight distance to prevent theaccidental disengagement of the pivot-pin. The pivot-pin 29 extendsbetween cams 31 of the cam-lever, the cams being formed at the end ofthe fork in the lever which receives the post 18. The notches 23 and 28are spaced equal distances apart and obviously permit of the bitbeingadjusted to differentelevations above the bench. When the pivot-pin 29of the camlever is engaged in the notch immediately below theclamping-block, the cams rest on the under side of the latter at theopposite sides of the post, the clamping-block preferably having aserrated upper face so that when it is pressed upwardly it will firmlyengage the upper walls of the grooves 17. The handle of the lever iscurved upwardly to pass through the slot 16 at the rear of theclamping-block and stand above the bench When the lever is depressed,the cams force the clampingblock upwardly and secure the block againstmoyement, at the same time the post is drawn downwardly under the actionof the pivot-pin 29, causing the bit to swing forwardly and downwardlyinto engagement with the board which is to be clamped to the top of thetable, the swinging movement of the bit taking place with the pivot 24:as its fulcrum. It is thus seen that by a single movement of the lever,the dog is locked in adjusted position and the bit given both a downwardand a forward movement.

Any suitable means may be provided in connection with the bench forengaging the opposite end of the board. I, however, preferably employfor this purpose a post 18 and a bit 19, similar to the post 18 and bit19, the post being adapted to be passed into any one of a number ofopenings 32 formed in the table at one side of the slot 16.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. An adjustable bench dog comprising a clamping-block, a post having abit, a pivot block carried by the clamping-block and having a pivotsupporting the post adjacent to one edge thereof, and an operating leverfulcrumed on the post adjacent to the opposite edge thereof and having acam arranged to engage the under side of the clampingblock.

2. A bench dog comprising a clampingblock, a post supported on theclampingblock and extending therethrough and having a bit secured to itsupper end, and an operating-lever fulcrumed on the post and having a cambearing on the under side of the clamping-block.

3. A bench dog comprising a clampingblock, a post arranged atapproximately right-angles to the clamping block and having a bitsecured to its upper end, a pivot for the. post adjacent to one edgethereof, supported on and above the clamping-block, an operating leverhaving av pivot arranged below the clamping-block and carried by thepost adjacent to its opposite edge, and a cam in connection with theoperating lever, arranged to bear on the under side of theclampingblock.

4. A bench dog comprising a clampingblock, a post extending through theclamping-block, having a bit secured to the upper portion thereof andprovided with pivot notches in its opposite edges, a support carried bythe clamping-block, having a pivot arranged thereabove adapted to engagein any one of the notches at one edge of the post, a clamping leverhaving a fork to receive the post, cams carried by the fork, and apivot-pin extending between the cams and adapted to be engaged in anyone of the notches at the opposite edge of the post and bring the camsto bear against the under side of the clamping-block.

5. The combination of a work bench having a slot extending therethrough,a clamping-block slidably supported in the slot, a post in connectionwith the clamping-block and extending through the slot, having a bit atthe upper end thereof, and an operating lever fulcrumed to the post andhaving a cam arranged to engage the under side of the clamping-block,with the handle of the lever extending through the slot above the top ofthe bench.

6. The combination of a work bench having a slot extending therethroughand provided with opposed grooves at the opposite sides of the slot, aclamping-block slidable in the grooves, a post extending through theslot and clamping-block, having a bit secured to the upper portionthereof, and an operating lever having a cam arranged to bind the blockin the grooves, and fulcrumed at a point on the post to force the bitdownwardly and forwardly when the lever is moved to clamping position.

7. The combination of a work bench having an undercut slot, aclamping-block adblock upwardly into clamping engagement with the benchand force the dog clownwardly and forwardly.

8. The combination of av work bench hav ing an undercut slot, a clampingblock slidable in the slot, a post passing through and fulcrumed on theblock to have a slight tilting movement, a dog to clamp a board to thetop of the bench, carried by. and movable with the post, and anoperating lever having a cam arranged to bear against the under side ofthe clamping block and fulcrumed to the post at a point to swing thepost with the dog downwardly and forwardly when the cam forces the blockupwardly into clamping engagement with the bench.

9. The combination of a work bench having an undercut slot, aclamping-block slidable in the slot, adog supported on the clampingblock to have a slight tilting movement, and an operating lever arranged7

